You’ve been on the Bourbon Trail, you've heard the stories: the great-great-grandpappy's secret recipe, the dusty attic, the promises of a "uniquely smooth finish" that tastes exactly like the last five bottles you bought. 8th Day Distillery in Indianapolis skips all that. So, when a new bottle comes along, you're right to ask: What are they actually doing differently? The answer, as with most things worth drinking, is simple: the mashbill and the yeast. These aren't the names of a new indie folk band; they are the fundamental building blocks of whiskey. 8th Day’s approach is what separates them from the ever-growing pack. Instead of a secret, here is the exact recipe. They trust you to realize that execution is harder than a list of ingredients. Let's talk about what's actually in the bottle.
The mashbill is just the grain recipe. Bourbon has to be at least 51% corn, that’s the law, and the sweet foundation. The rest is a high-stakes, choose-your-own-adventure with rye and malted barley. Think of corn as the sugar, rye as the necessary spice, and barley as the workhorse that turns starch into fermentable fuel.
So, 8th Day’s Straight Bourbon Whiskey is a transparent 70% corn, 25% rye, and 5% malted barley. Seventy percent corn is the polite entry, the classic caramel and vanilla everyone expects. But that 25% rye is where they make a statement. This is a high-rye bourbon, not a “whisper of spice” affair. They crank the rye to deliver a bold kick of black pepper, mint, and a zesty character that keeps the sweetness honest. It’s the complexity that saves it from being a single-note sugar bomb. The 5% barley simply does the job, converting starches, without muddying the primary flavors of the corn and rye.
Their Rye Whiskey flips the script entirely: 58% rye and 42% corn. It just clears the 51% rye legal requirement, but the 42% corn is the secret weapon. That high corn content injects a sweetness many ryes are missing. You get the spicy, bold punch a good rye should have, but with an unexpected smoothness and vanilla from the corn. It’s a rye for bourbon fanatics, or a bourbon for rye fanatics. Stop thinking about it and just pour a glass.
If the mashbill is the recipe, yeast is the highly opinionated chef. The best ingredients in the world won’t save a terrible meal. Yeast eats the grain sugars and, in its glorious, microscopic life cycle, produces alcohol and compounds called congeners. These congeners are the real story; they’re where the magic is, the fruity, floral, earthy, and spicy notes that separate a unique whiskey from a commodity.
This is where it gets secretive. The big distillers guard their yeast strains like Fort Knox. 8th Day doesn’t broadcast the alphanumeric code of their preferred ‘fungal friend,’ but their “Honestly Local” focus offers a big clue: they are not using generic, off-the-shelf yeast. The flavor profile proves it. Those subtle fruit esters, the orange marmalade in the bourbon, don’t come from the grain or the barrel; that’s yeast working overtime. A smart yeast selection, combined with controlled fermentation, coaxes out specific flavors. The yeast is a workhorse that turns sweet, grainy soup into a complex spirit with a distinct personality. The resulting flavor is their signature, and it’s every bit as important as the recipe.
Here’s the thing about tasting notes: they’re subjective. I might taste brown sugar and smokey leather in 8th Day’s bourbon, and you might taste toasted marshmallow and your grandfather’s favorite armchair. Neither of us is wrong. Your palate is shaped by your own experiences and biology. So, how do you know if you’ll like a bottle before you drop your hard-earned cash on it?
That’s where technology, thankfully, provides a solution that doesn’t involve you trying to lick your screen. The OAKR app is like having a bourbon sommelier in your pocket, minus the snooty attitude. OAKR aggregates tasting data from a panel of blind tasters to create a comprehensive flavor profile for thousands of spirits. Instead of relying on one person’s opinion, you get a data-driven consensus on what a bourbon actually tastes like.
You can use the app to look up 8th Day’s Straight Bourbon and see the full flavor wheel, from its sweet caramel and vanilla notes to that signature rye spice. More importantly, OAKR can give you personalized recommendations based on the spirits you already know and love. If you’re a fan of other high-rye bourbons, OAKR will likely point you toward 8th Day. It takes the guesswork out of discovering your next favorite bottle.
So, next time you’re staring at the liquor store shelf, try 8th Day Distillery. Now you know it’s not just another pretty bottle with a folksy backstory. It’s a product of deliberate, expert choices: a high-rye mashbill for character and a yeast program that builds a unique flavor foundation. And when you do, have the OAKR app ready. Pour a glass, see if you can find those notes, and discover what makes this Indianapolis distillery a genuine standout.
Login to OAKR for spirit profile flavor data, create your own lists and customize your palate to get custom somm recommendations on whiskey you’ll love.
